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Unaudited Condensed Consolidated Statement Of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Statement of Comprehensive Income [Abstract]    
Net income $ 46,218us-gaap_NetIncomeLoss $ 83,397us-gaap_NetIncomeLoss
Other comprehensive gains (losses):    
Unrealized holding gain (loss) 1,065us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax (743)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Gain/(loss) reclassified to net income (40)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 381us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Total other comprehensive income (loss) 1,025us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (362)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income $ 47,243us-gaap_ComprehensiveIncomeNetOfTax $ 83,035us-gaap_ComprehensiveIncomeNetOfTax